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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dae56a83bf120f69bd7e7944a2e46e4231e744de36a23eb74af31d6f1ff9c6e' 
  AND token = 'qFsgk69PJ44s3l5SSSJPVYu8ku8Ro8ktKHwCRpbEh6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}